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May 19, 2017
City of Toronto proceeding with European Gypsy Moth aerial spraying
As previously announced, the City of Toronto has determined locations and dates for aerial spraying as part of its ongoing efforts to manage the European Gypsy Moth (Lymantria dispar) infestation. The European Gypsy Moth is a defoliating insect that is considered a major pest in North America.

The City of Toronto is planning two rounds of aerial spraying of Foray 48B Biological Insecticide Aqueous Suspension containing the active ingredient Bacillus thuringiensis subspecies kurstaki (Btk) registered under the Pest Control Products Act (Registration Number: 24977).

The first spray day will take place on Tuesday, May 23 between 5 and 7:30 a.m. in the following areas:

• Princess Margaret Boulevard and Kipling Avenue
• Thorncrest Road
• Edenbridge Drive
• Edenbrook Hill
• Valecrest Drive
• North Drive
• Royal York Road and Bloor Street West
• The Kingsway
• Baby Point Crescent/Baby Point Road
• Jane Street and Bloor Street West

The second spray will take place three to five days later, weather permitting, between 5 and 7:30 a.m. in the same areas.

The City of Toronto has and will continue to work with neighbouring municipalities and other levels of government to manage the European Gypsy Moth (Lymantria dispar) infestation. In west Toronto, the infestation levels have reached a point where mechanical control methods and ground spraying of pesticides on individual trees are no longer effective in controlling the Gypsy Moth population.

Spraying is dependent on weather and will only be done in the right conditions. As a result, specific spray dates are chosen 48 hours in advance, and can be cancelled if weather conditions change. Residents within the affected spray zones are encouraged to check for updates on the City's website at or by calling 311 (if calling from outside Toronto, 1-855-551-5150).

A two-engine helicopter with an ultra-low-volume spray system will fly about 15 to 30 metres above the tree tops and will spray Btk. Local road closures will be in effect during the aerial spraying to minimize any potential risks associated with the low-flying helicopter. Notification signs will be posted along local roads to announce the closures.

Btk does not affect adult moths and butterflies, other insects, honeybees, fish, birds or mammals. It kills young caterpillars that are present at the time of spray. Through aerial spraying, Btk will be applied to the foliage of the trees and the caterpillars must feed on the treated leaves for it to be effective.

The health and safety of residents and the health of the environment are top priorities for the City of Toronto. Health Canada affirms that the Btk pesticide is not linked to any significant health risks to humans from either direct or indirect (i.e. spraying) contact with the product. No special precautions are required for residents in the spray zone. However, if you wish to avoid exposure to Btk, remain indoors during and immediately after the spraying. Residents can also cover patio furniture or outdoor playing areas prior to the spraying or hose them off afterward.

Toronto is Canada's largest city, the fourth largest in North America, and home to a diverse population of about 2.8 million people. It is a global centre for business, finance, arts and culture and is consistently ranked one of the world's most livable cities. In 2017, Toronto will honour Canada's 150th birthday with "TO Canada with Love," a year-long program of celebrations, commemorations and exhibitions. For information on non-emergency City services and programs, Toronto residents, businesses and visitors can visit, call 311, 24 hours a day, 7 days a week, or follow us on Twitter at and on Instagram at

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